Sell P-hydroxybenzoic Acid

Quality standard: ITEMS  SPECIFICATONS   Liquid crystal grade  Industrial grade   Appearance: white crystal powder  white crystal powder   Color: < 30 APHA  40APHA   Melting point(°C): 214-217 213-217   Solubility: clear, transparent, Colorless  clear, transparent, Colorless   Methanol insoluble matter Ug/g ≤ 50     Assay (titration method)% ≥ 99.5  ≥99.0   Assay (GC) % ≥ 99.5  ≥ 99.0   Salicylic acid (GC) % ≤ 0.02  ≤ 0.10   Benzene powder(GC) % ≤0.01 ≤ 0.10   Loss on drying % ≤ 0.20  ≤ 0.50   Ash %  ≤0.02  0.15   Sulfate Ug/g  ≤ 50  ≤ 500   Chloride Ug/g ≤ 50  ≤ 200   potassium ion Ug/g ≤ 10   Sodium ion Ug/g  ≤ 10   Ferric ion Ug/g  ≤ 10